Been talking with this girl who wants to meet up soon to fool around, the only problem is I've recently (the past few months or so) developed some trouble getting/staying hard. Even with a sexy as hell escort naked bent over in front of me, I've not been able to...

I'm pretty sure I know the reason, which is because I jerk off so much and so fast/hard (can barely even stay hard half the time even when jerking off).

So without taking any erection pills, and preferably without having to stop masturbating for a while, anybody got any tips/secrets or ways to assure I'll be able to get and maintain an erection?

Well, that happens when you condition your mind and body to masturbation and porn.
I suggest you try thinking of porn when you are with her. That is why I did in those old times.